The beta of Valve's Team Fortress 2 is now playing on Steam for gamers who pre-purchased The Orange Box through Steam. In Team Fortress 2 players choose from a range of unique character classes such as medic, spy, sniper, or engineer and must work together to complete a variety of tactical objectives. The PC edition of The Orange Box - which also features Half-Life 2: Episode Two, Portal, as well as the complete Half-Life 2 series - is now available for pre-purchase via Steam through October 10th for 10% off the $49.95 regular price.